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PROPDESC_AGGREGATION_TYPE enumeration (propsys.h)

Describes how property values are displayed when multiple items are selected. For a particular property, PROPDESC_AGGREGATION_TYPE describes how the property should be displayed when multiple items that have a value for the property are selected, such as whether the values should be summed, or averaged, or just displayed with the default "Multiple Values" string.

Syntax

typedef enum PROPDESC_AGGREGATION_TYPE {
  PDAT_DEFAULT = 0,
  PDAT_FIRST = 1,
  PDAT_SUM = 2,
  PDAT_AVERAGE = 3,
  PDAT_DATERANGE = 4,
  PDAT_UNION = 5,
  PDAT_MAX = 6,
  PDAT_MIN = 7
} ;

Constants

 
PDAT_DEFAULT
Value: 0
Display the string "Multiple Values".
PDAT_FIRST
Value: 1
Display the first value in the selection.
PDAT_SUM
Value: 2
Display the sum of the selected values. This flag is never returned for data types VT_LPWSTR, VT_BOOL, and VT_FILETIME.
PDAT_AVERAGE
Value: 3
Display the numerical average of the selected values. This flag is never returned for data types VT_LPWSTR, VT_BOOL, and VT_FILETIME.
PDAT_DATERANGE
Value: 4
Display the date range of the selected values. This flag is returned only for values of the VT_FILETIME data type.
PDAT_UNION
Value: 5
Display a concatenated string of all the values. The order of individual values in the string is undefined. The concatenated string omits duplicate values; if a value occurs more than once, it appears only once in the concatenated string.
PDAT_MAX
Value: 6
Display the highest of the selected values.
PDAT_MIN
Value: 7
Display the lowest of the selected values.

Remarks

These values are defined in propsys.h and propsys.idl.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Header propsys.h